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. 1999 Apr;229(4):579–584. doi: 10.1097/00000658-199904000-00019

Role of pleural lavage cytology before resection for primary lung carcinoma.

M Okada 1, N Tsubota 1, M Yoshimura 1, Y Miyamoto 1, Y Maniwa 1
PMCID: PMC1191746  PMID: 10203093

Abstract

OBJECTIVE: To investigate the role of pleural lavage cytology (PLC) in resection for primary lung carcinoma. SUMMARY BACKGROUND DATA: The prognostic significance of PLC before manipulation is still controversial. METHODS: Cytology of pleural lavage immediately after thoracotomy but before any manipulation of the lung was examined in 500 consecutive patients with lung cancer with no pleural effusion who underwent pulmonary resections. Eighteen patients who already had pleural dissemination were excluded from this study. RESULTS: Eighteen of 482 patients (3.7%) had positive cytologic findings. The positivity of PLC was significantly correlated with histology, extension of tumor to pleura, and presence of lymphatic permeation or vascular involvement by tumor. Positive lavage findings were seen only in adenocarcinoma. Because 6.3% of the patients with adenocarcinoma had positive cytologic findings, it is vital to perform PLC before curative resections for lung cancer, especially adenocarcinoma. The 5-year survival rates of the patients having negative and positive lavage findings were 52.9% and 14.6%, respectively. The prognosis of the patients with positive lavage findings was as poor as that of the patients with stage IIIB disease and that of the patients with malignant effusion. CONCLUSIONS: Positive findings on PLC indicate exfoliation of cancer cells into the pleural cavity, which is an essential prognostic factor. In addition, we should regard positive cytologic findings as a subclinical malignant pleural effusion that is pathologic stage T4.

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Selected References

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